How is self-employment tax calculated?

Federal self-employment tax is 15.3% on 92.35% of your net profit: 12.4% Social Security up to the $168,600 wage base (2024) plus 2.9% Medicare with no cap. High earners add a 0.9% additional Medicare tax above $200,000 single or $250,000 joint.

How does Kansas tax self-employment income?

Kansas has no separate self-employment tax. Your net profit, minus the deductible half of your federal SE tax, flows into Kansas taxable income and is taxed at the 2024 graduated brackets of 3.1%, 5.25%, and 5.7%.

What is the half-SE-tax deduction?

You may deduct one-half of your federal self-employment tax as an above-the-line adjustment to income. This calculator subtracts that half before applying the Kansas brackets, which lowers your state taxable income.

Does this include federal income tax?

No. It computes the federal SE (Social Security and Medicare) tax plus Kansas state income tax. Your federal income tax bracket, the QBI deduction, and the Kansas standard deduction and exemptions are separate and not modeled here.

Is the Social Security portion capped?

Yes. The 12.4% Social Security portion applies only up to the annual wage base, $168,600 for 2024. The 2.9% Medicare portion has no cap, and the 0.9% additional Medicare surtax applies above the high-income thresholds.

Kansas Self-Employment Tax Calculator

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Self-employed Kansans pay the full 15.3 percent federal self-employment tax plus Kansas state income tax on the same profit. This calculator computes both layers, including the deductible half of the SE tax, so you can estimate your total quarterly liability before filing.

How it works

Federal self-employment tax is built on a base of 92.35 percent of your net profit:

SE base = net profit × 0.9235
Social Security = 12.4% of SE base, capped at the $168,600 wage base
Medicare        = 2.9% of SE base (no cap)
Additional Medicare = 0.9% of SE base above $200,000 (single) or $250,000 (joint)

You may deduct one-half of the resulting SE tax above the line. The calculator subtracts that half from your profit to get Kansas taxable income, then applies the 2024 Kansas brackets: 3.1 percent up to 15,000 dollars, 5.25 percent to 30,000 dollars, and 5.7 percent above that (single schedule).

Example

On 80,000 dollars of net profit, the SE base is 73,880 dollars. Social Security is 12.4% (9,161.12 dollars) and Medicare is 2.9% (2,142.52 dollars), for a federal SE tax of about 11,303.64 dollars. Half of that (5,651.82 dollars) is deducted, leaving 74,348.18 dollars taxable in Kansas, taxed at the graduated brackets.

Notes

This is an estimate, not tax advice. It excludes your federal income tax, the 20 percent qualified business income (QBI) deduction, and the Kansas standard deduction and personal exemptions — all of which change your final numbers. Confirm at irs.gov and ksrevenue.gov.